from mapnik import Map, Layer
proj4 = '+proj=lcc +lat_1=45.89893890000052 +lat_2=47.69601440000037 +lat_0=46.8 +lon_0=2.33722917 +x_0=600000 +y_0=200000 +ellps=intl +units=m +no_defs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)